摘要
以美国Ultramet公司生产的Carbon-Foam为滤料,应用生物滤床处理NO模拟废气,研究了生物滤床在好氧条件下对NO的处理效果,并对NO去除过程的作用机理进行了探讨.研究结果表明,NO的去除效率随空床停留时间(EBRT)的增加而增加,在EBRT为6min、进口NO浓度为107.14mg.m-3时,NO去除效率为63%;随着进口浓度的提高,NO去除效率降低,而NO消除负荷增加.生物滤床中NO的去除过程由微生物硝化和化学氧化共同作用完成,其中以微生物硝化作用为主.化学氧化作用包括气相过程和液相过程2部分,当EBRT<4.6min时,液相中的化学氧化作用大于气相;当EBRT>4.6min时,气相中的化学氧化作用大于液相.当EBRT≤2min时,传质是NO去除过程的控制步骤,此时,微生物硝化作用和液相中的化学氧化作用均受传质过程控制.
The removal process of nitric oxide （NO） nitrification in a biofiher packed with Carbon-Foam （Ultramet, US） was investigated and the mechanism was discussed. The results showed that the removal efficiency increased with the empty bed resident time （EBRT）. NO removal efficiency was up to 63 % at the EBRT of 6 min and the inlet NO concentration of 107.14 mg·m^-3 . The removal efficiency decreased with the increasing of the inlet NO concentration, while the NO elimination capacity increased. The removal process consisted of chemical oxidation and bio-nitrification in the biofilter. The bioprocess contributed mainly to the removal. The chemical oxidation occurred in both gas and liquid phases. More oxidation reacted in gas phase than that in liquid phase when EBRT was greater than 4.6 min. The mass transfer process became the limited step of NO removal when the EBRT was less than 2 min.
出处
《环境科学学报》
CAS
CSCD
北大核心
2005年第11期1436-1442,共7页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.20276070
20576124)
浙江省自然科学基金项目(No.202084)~~
